jammy Posted January 2, 2009 Report Share Posted January 2, 2009 As it reads...got 215/35/18s and not sure what to put them on... oem spec for 15s is f33 r29 Quote Link to comment Share on other sites More sharing options...
P4UL T Posted January 2, 2009 Report Share Posted January 2, 2009 On the Mondeo ST (225/40/18) we run 36 front and up to 39 rear Quote Link to comment Share on other sites More sharing options...
jammy Posted January 2, 2009 Author Report Share Posted January 2, 2009 That waighs eleventy 12 times heavier then a mk3 astra though Quote Link to comment Share on other sites More sharing options...
dazz33 Posted January 2, 2009 Report Share Posted January 2, 2009 got "18"`s on my lex..225/40/ aspect...they are 35psi all round Quote Link to comment Share on other sites More sharing options...
Rich Posted January 2, 2009 Report Share Posted January 2, 2009 Start with the OEM figures and work your way from there, all depends on what's best for you I think. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 2, 2009 Author Report Share Posted January 2, 2009 Got 30 alround atm seems a little light lol...may drop to 28 and go from there... Quote Link to comment Share on other sites More sharing options...
Rich Posted January 2, 2009 Report Share Posted January 2, 2009 On the 306 with 14's the recommended pressure is 35 but I've put that at 30 as the traction was better. Those oem figures are only a guide aren't they? Quote Link to comment Share on other sites More sharing options...
jammy Posted January 2, 2009 Author Report Share Posted January 2, 2009 Dunno mate... I dont trust any oem figure's Quote Link to comment Share on other sites More sharing options...
Tony Posted January 2, 2009 Report Share Posted January 2, 2009 The extra diameter has little influence on the tyre pressure, it's more to do with the contact patch, the front/ rear weight disparity and the sidewalls slip angle value. All said the OEM looks like a good template in my opinion. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 2, 2009 Author Report Share Posted January 2, 2009 I had them on 32 30 and felts very jittery on bumps and also light steering...have put them on 28 and love it but fear that thay are underinflated so tommoro will put the front on 30 and leave rears @28 psi Quote Link to comment Share on other sites More sharing options...
Tony Posted January 2, 2009 Report Share Posted January 2, 2009 I had them on 32 30 and felts very jittery on bumps and also light steering...have put them on 28 and love it but fear that thay are underinflated so tommoro will put the front on 30 and leave rears @28 psi That's the only way to do it mate.... First ensure the handling feels correct then over time monitor the tyre wear and adjust accordingly. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 2, 2009 Author Report Share Posted January 2, 2009 Ok tony thanks taken me 4 months to get my suspension setting right lol may take me that with my pressures now !!! Quote Link to comment Share on other sites More sharing options...
Tony Posted January 2, 2009 Report Share Posted January 2, 2009 Ok tony thanks taken me 4 months to get my suspension setting right lol may take me that with my pressures now !!! Welcome to the world of the modified Quote Link to comment Share on other sites More sharing options...
eddie Posted March 13, 2009 Report Share Posted March 13, 2009 got "18"`s on my lex..225/40/ aspect...they are 35psi all round same here! Quote Link to comment Share on other sites More sharing options...
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